Analysis of digester design concepts

Ashare, E.; Wilson, E. H.

doi:10.2172/5758432

Cited by 7 publications

(3 citation statements)

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“…Anaerobic digestion can be effectively used as a means of producing biogas from algae and algal remnants after extraction (Ashare and Wilson, 1979). In particular, the organic fractions of the algae remaining after oil extraction are amenable to anaerobic digestion.…”

Section: Processing Of Algal Remnants After Extractionmentioning

confidence: 99%

Power of Plankton: Effects of Algal Biodiversity on Biocrude Production and Stability

Narwani

Lashaway

Hietala

et al. 2016

Environ. Sci. Technol.

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Algae-derived biocrude oil is a possible renewable energy alternative to fossil fuel based crude oil. Outdoor cultivation in raceway ponds is estimated to provide a better return on energy invested than closed photobioreactor systems. However, in these open systems, algal crops are subjected to environmental variation in temperature and irradiance, as well as biotic invasions which can cause costly crop instabilities. In this paper, we used an experimental approach to investigate the ability of species richness to maximize and stabilize biocrude production in the face of weekly temperature fluctuations between 17 and 27 °C, relative to a constant-temperature control. We hypothesized that species richness would lead to higher mean biocrude production and greater stability of biocrude production over time in the variable temperature environment. Counter to our hypothesis, species richness tended to cause a decline in mean biocrude production, regardless of environmental temperature variation. However, biodiversity did have stabilizing effects on biocrude production over time in the variable temperature environment and not in the constant temperature environment. Altogether, our results suggest that when the most productive and stable monoculture is unknown, inoculating raceway ponds with a diverse mixture of algae will tend to ensure stable harvests over time.

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Section: Processing Of Algal Remnants After Extractionmentioning

confidence: 99%

Power of Plankton: Effects of Algal Biodiversity on Biocrude Production and Stability

Narwani

Lashaway

Hietala

et al. 2016

Environ. Sci. Technol.

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“…The refrigerant specific enthalpy values were obtained from state equations developed based on Propane published properties [23].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Solar powered vapor absorption system using propane and alkylated benzene AB300 oil

Al-Dadah

Jackson²,

Rezk

2011

Applied Thermal Engineering

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This paper describes experimental work on a solar assisted vapour absorption air conditioning system using Propane (refrigerant) and Alkylated Benzene (AB300-refrigeration lubrication oil, absorbent). Preliminary experiments to assess the miscibility of propane in various lubricating oils namely Shell Clavus oils 32 and 64 and Alkylated Benzene oils AB150 and AB300 indicated that Propane is most miscible in Alkylated Benzene AB300. The vapour absorption system is a single stage absorption consisting of evaporator, absorber, generator and condenser. The system is equipped with heat pipes installed between the absorber and the pre-generator to recover the heat of absorption. The heat applied to the generator replicated the solar thermal energy based on the climatic conditions of Jamaica using flat plate collectors commonly used in Jamaica. Experiments at various evaporator, absorber and generator temperatures showed that the coefficient of performance of the system increases with increasing the generator temperature and with decreasing the absorber temperatures. The solar fraction for the flat plate collectors to produce the generator temperature needed to drive the absorption system is up to 50%.

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“…Calculated production d a t a for t h e reference 1000-ha refinery a r e presented in Table 4-1; t h e methane quantity represents t h e t o t a l from catalytic conversion (5% of t h e total) plus anaerobic digestion (95% from unreacted organics). Figure 4-5 shows schematically t h e anaerobic digestion process a s adapted for microalgae (Ashare and Wilson 1979). As discussed earlier, t h e organic fractions of t h e algae (all components except ash) a r e anaerobically digestible, so once t h e algae has been harvested, little if any pretreatment is required.…”

Section: Catalytic Conversionmentioning

confidence: 99%